It is one of the hot issues for international air traffic control research to utilize advantages of crosswind conditions for reducing the wake separation and enhancing airspace capacity appropriately In this paper, the wake vortex flow field of A320 airfoil is established. Based on the RANS method, the RKE equation is used to close the Reynolds stress term by two equations UDF (User defined function) programming technique is applied in establishing aircraft wake vortex flow field under the crosswind field of static wind, 1 m/s, 4 m/s, 7 m/s respectively. Through the TH1A supercomputer numerical simulation of wake vortex is therefore implemented. Hence, the evolution trend of the parameters such as the vortex core vertical sinking, the vorticity attenuation, the horizontal motion of the vortex core and the vortex core velocity are analyzed The results show that under the condition of static wind, with the slow sinking of the vortex, vortex vorticity decreases gradually. Under the disturbance of crosswind, the vorticity of vortex and the rolling moment increases rapidly in a short time Meanwhile, wake vortex spacing decreases rapidly after separation and rebound quickly. In the vertical direction, the vortex repeatedly jumps up and down. What’s more, the formation of strong crosswind induced turbulence shear gradient will lead to the vortex shedding, vortex bursting and rapid dissipation In the horizontal direction, the vortex will be blown away from the main flight path quickly under the impact of strong crosswind which is of great benefit to reduce the required wake separation and improve the efficiency of airport operation